Even though Chelsea had two goals disallowed by VAR reviews and were furious Maguire was not sent-off early on for an off-the-ball kick out at Michy Batshuayi. They were not able to have the win against Manchester United on Monday night.
The Victory lifts United up to seventh and within two points of Tottenham in fifth, which could be good enough to qualify for the Champions League next season pending Manchester City’s appeal again a two-season ban from European competition.
However, Blues boss Frank Lampard cut a frustrated figure as the flaws in both boxes which have seen his side win just four of their last 14 league games were exposed once more against ordinary opposition.
Lampard made a bold call before kick-off by again dropping the most expensive goalkeeper in football history, Kepa Arrizabalaga, to the bench in favour of the 38-year-old Willy Caballero.
Batshuayi also started with Tammy Abraham ruled out by injury and Lampard’s anger at missing out on a striker in the January window was borne out by a poor night for the misfiring Belgium forward.
Chelsea suffered another injury blow early on when N’Golo Kante hobbled off and the France World Cup winner is now a doubt to face Bayern Munich in the Champions League next week.
The loss of Kante did not disrupt the home side’s early rhythm as Reece James and Willian fired just wide.
Chelsea were then furious Maguire somehow escaped without being sent-off for kicking Batshuayi after the two collided in front of the dugouts.
Fernandes was unable to make much of an impact from open play in his second United appearance since a £47 million ($62 million) move from Sporting Lisbon.
However, the Portuguese international is a huge threat from set-pieces and nearly caught Caballero out with a free-kick that crashed back off the post.
Moments later, Fernandes provided his first assist for the Red Devils with a corner which Maguire powered home.
Lampard had seen enough from Batshuayi and handed Olivier Giroud a rare appearance off the bench for the final quarter.
The French striker thought he had given Chelsea a lifeline with a near post header, but was ruled offside after a VAR review.